Added conversion from Handshake to NetworkMessage and vice versa

Added a new ConnectionCode - Close
TcpServer: AddToClientsList and AllocateID are now called add_to_clients_list and allocate_id respectively and are now private, removed SendHandshake method - we now use SendMessage method and the HandshakeToNetworkMessage method in the Handshake class
Added a new method to Utility::StringConverter - FromString
Changed NetworkMessage conversions to allow Handshake conversions
NetworkMessage: if subject is 1 then the NetworkMessage is a handshake
I may be missing something but im going to check it
I may be overcomplicating this but i want to make it as simple as possible xD

VoidNetVS/VoidNetVS/VoidNetVS.vcxproj

@@ -134,7 +134,7 @@
       <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-      <AdditionalIncludeDirectories>F:\VoidNet\include;F:\VoidNet\src</AdditionalIncludeDirectories>
+      <AdditionalIncludeDirectories>..\..\include;..\..\src</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
       <EnableCOMDATFolding>true</EnableCOMDATFolding>